Tibetan Youth Congress who organised the rally said they protested against what they called the denial of human rights in Tibet.
Activists, wearing yellow T-shirts and carrying Tibetan flags, swooped down on the lawns outside the heavily-secured embassy and chanted slogans against China.
They were carried away by police into a waiting bus.
Rioting in March 2008 in Tibet's capital, Lhasa left at least 22 people dead and set off a wave of protests across parts of western China traditionally inhabited by Tibetans.
Tibetan rights groups say nearly 140 Tibetans were killed during the suppression.
China blamed followers of the exiled Dalai Lama for fomenting the 2008 disturbances - a charge the Buddhist leader denies.
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